1/*
2 * Small jpeg decoder library (Internal header)
3 *
4 * Copyright (c) 2006, Luc Saillard <luc@saillard.org>
5 * Copyright (c) 2012 Intel Corporation.
6 * All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 *
10 * - Redistributions of source code must retain the above copyright notice,
11 *  this list of conditions and the following disclaimer.
12 *
13 * - Redistributions in binary form must reproduce the above copyright notice,
14 *  this list of conditions and the following disclaimer in the documentation
15 *  and/or other materials provided with the distribution.
16 *
17 * - Neither the name of the author nor the names of its contributors may be
18 *  used to endorse or promote products derived from this software without
19 *  specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 *
33 */
34
35
36#ifndef __TINYJPEG_INTERNAL_H_
37#define __TINYJPEG_INTERNAL_H_
38
39#include <setjmp.h>
40
41#define SANITY_CHECK 1
42
43struct jdec_private;
44
45#define HUFFMAN_BITS_SIZE  256
46
47#define HUFFMAN_TABLES	   4
48#define COMPONENTS	   4
49#define JPEG_MAX_WIDTH	   2048
50#define JPEG_MAX_HEIGHT	   2048
51#define JPEG_SCAN_MAX	   4
52
53enum std_markers {
54   DQT  = 0xDB, /* Define Quantization Table */
55   SOF  = 0xC0, /* Start of Frame (size information) */
56   DHT  = 0xC4, /* Huffman Table */
57   SOI  = 0xD8, /* Start of Image */
58   SOS  = 0xDA, /* Start of Scan */
59   RST  = 0xD0, /* Reset Marker d0 -> .. */
60   RST7 = 0xD7, /* Reset Marker .. -> d7 */
61   EOI  = 0xD9, /* End of Image */
62   DRI  = 0xDD, /* Define Restart Interval */
63   APP0 = 0xE0,
64};
65
66
67struct huffman_table
68{
69  /*bits and values*/
70	unsigned char bits[16];
71	unsigned char values[256];
72};
73
74struct component
75{
76  unsigned int Hfactor;
77  unsigned int Vfactor;
78  unsigned char quant_table_index;
79  unsigned int cid;
80};
81
82
83typedef void (*decode_MCU_fct) (struct jdec_private *priv);
84typedef void (*convert_colorspace_fct) (struct jdec_private *priv);
85
86struct jpeg_sos
87{
88  unsigned int nr_components;
89  struct {
90    unsigned int component_id;
91    unsigned int dc_selector;
92    unsigned int ac_selector;
93  }components[4];
94};
95
96struct jdec_private
97{
98  /* Public variables */
99  unsigned int width[JPEG_SCAN_MAX], height[JPEG_SCAN_MAX];	/* Size of the image */
100
101  /* Private variables */
102  const unsigned char *stream_begin, *stream_end,*stream_scan;
103  unsigned int stream_length;
104
105  const unsigned char *stream;	/* Pointer to the current stream */
106
107  struct component component_infos[COMPONENTS];
108  unsigned int nf_components;
109  unsigned char Q_tables[COMPONENTS][64];		/* quantization tables, zigzag*/
110  unsigned char Q_tables_valid[COMPONENTS];
111  struct huffman_table HTDC[HUFFMAN_TABLES];	/* DC huffman tables   */
112  unsigned char HTDC_valid[HUFFMAN_TABLES];
113  struct huffman_table HTAC[HUFFMAN_TABLES];	/* AC huffman tables   */
114  unsigned char HTAC_valid[HUFFMAN_TABLES];
115  struct jpeg_sos cur_sos;  /* current sos values*/
116  int default_huffman_table_initialized;
117  int restart_interval;
118};
119
120#endif
121
122